학술논문
Readout of a quantum processor with high dynamic range Josephson parametric amplifiers
Document Type
Working Paper
Author
White, T. C.; Opremcak, Alex; Sterling, George; Korotkov, Alexander; Sank, Daniel; Acharya, Rajeev; Ansmann, Markus; Arute, Frank; Arya, Kunal; Bardin, Joseph C.; Bengtsson, Andreas; Bourassa, Alexandre; Bovaird, Jenna; Brill, Leon; Buckley, Bob B.; Buell, David A.; Burger, Tim; Burkett, Brian; Bushnell, Nicholas; Chen, Zijun; Chiaro, Ben; Cogan, Josh; Collins, Roberto; Crook, Alexander L.; Curtin, Ben; Demura, Sean; Dunsworth, Andrew; Erickson, Catherine; Fatemi, Reza; Flores-Burgos, Leslie; Forati, Ebrahim; Foxen, Brooks; Giang, William; Giustina, Marissa; Dau, Alejandro Grajales; Hamilton, Michael C.; Harrington, Sean D.; Hilton, Jeremy; Hoffmann, Markus; Hong, Sabrina; Huang, Trent; Huff, Ashley; Iveland, Justin; Jeffrey, Evan; Kieferová, Márika; Kim, Seon; Klimov, Paul V.; Kostritsa, Fedor; Kreikebaum, John Mark; Landhuis, David; Laptev, Pavel; Laws, Lily; Lee, Kenny; Lester, Brian J.; Lill, Alexander; Liu, Wayne; Locharla, Aditya; Lucero, Erik; McCourt, Trevor; McEwen, Matt; Mi, Xiao; Miao, Kevin C.; Montazeri, Shirin; Morvan, Alexis; Neeley, Matthew; Neill, Charles; Nersisyan, Ani; Ng, Jiun How; Nguyen, Anthony; Nguyen, Murray; Potter, Rebecca; Quintana, Chris; Roushan, Pedram; Sankaragomathi, Kannan; Satzinger, Kevin J.; Schuster, Christopher; Shearn, Michael J.; Shorter, Aaron; Shvarts, Vladimir; Skruzny, Jindra; Smith, W. Clarke; Szalay, Marco; Torres, Alfredo; Woo, Bryan; Yao, Z. Jamie; Yeh, Ping; Yoo, Juhwan; Young, Grayson; Zhu, Ningfeng; Zobrist, Nicholas; Chen, Yu; Megrant, Anthony; Kelly, Julian; Naaman, Ofer
Source
Appl. Phys. Lett. 122, 014001 (2023)
Subject
Language
Abstract
We demonstrate a high dynamic range Josephson parametric amplifier (JPA) in which the active nonlinear element is implemented using an array of rf-SQUIDs. The device is matched to the 50 $\Omega$ environment with a Klopfenstein-taper impedance transformer and achieves a bandwidth of 250-300 MHz, with input saturation powers up to -95 dBm at 20 dB gain. A 54-qubit Sycamore processor was used to benchmark these devices, providing a calibration for readout power, an estimate of amplifier added noise, and a platform for comparison against standard impedance matched parametric amplifiers with a single dc-SQUID. We find that the high power rf-SQUID array design has no adverse effect on system noise, readout fidelity, or qubit dephasing, and we estimate an upper bound on amplifier added noise at 1.6 times the quantum limit. Lastly, amplifiers with this design show no degradation in readout fidelity due to gain compression, which can occur in multi-tone multiplexed readout with traditional JPAs.
Comment: 10 pages, 10 figures
Comment: 10 pages, 10 figures